rails/rails — comment on commit aaff1a4101605b7d2e2386d3e7612a43fbe07c8d
File: activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb line 420
By marcbowes:

As with the above, why not just use `class_to_pool[name] = pool`? Also, why bother with the return since the assignment operator already returns `pool`.